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120 lines
3.8 KiB
Objective-C
120 lines
3.8 KiB
Objective-C
//
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// ASPagerNode.m
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// AsyncDisplayKit
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//
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// Created by Levi McCallum on 12/7/15.
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// Copyright © 2015 Facebook. All rights reserved.
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//
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#import "ASPagerNode.h"
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#import "ASDelegateProxy.h"
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#import "ASDisplayNode+Subclasses.h"
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#import "UICollectionViewLayout+ASConvenience.h"
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@interface ASPagerNode () <ASCollectionDataSource, ASCollectionViewDelegateFlowLayout, ASDelegateProxyInterceptor>
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{
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UICollectionViewFlowLayout *_flowLayout;
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ASPagerNodeProxy *_proxy;
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__weak id <ASPagerNodeDataSource> _pagerDataSource;
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}
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@end
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@implementation ASPagerNode
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@dynamic view, delegate, dataSource;
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- (instancetype)init
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{
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UICollectionViewFlowLayout *flowLayout = [[UICollectionViewFlowLayout alloc] init];
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flowLayout.scrollDirection = UICollectionViewScrollDirectionHorizontal;
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flowLayout.minimumInteritemSpacing = 0;
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flowLayout.minimumLineSpacing = 0;
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return [self initWithCollectionViewLayout:flowLayout];
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}
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- (instancetype)initWithCollectionViewLayout:(UICollectionViewFlowLayout *)flowLayout;
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{
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ASDisplayNodeAssert([flowLayout asdk_isFlowLayout], @"ASPagerNode requires a flow layout.");
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self = [super initWithCollectionViewLayout:flowLayout];
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if (self != nil) {
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_flowLayout = flowLayout;
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}
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return self;
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}
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- (void)didLoad
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{
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[super didLoad];
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ASCollectionView *cv = self.view;
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#if TARGET_OS_IOS
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cv.pagingEnabled = YES;
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cv.scrollsToTop = NO;
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#endif
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cv.allowsSelection = NO;
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cv.showsVerticalScrollIndicator = NO;
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cv.showsHorizontalScrollIndicator = NO;
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// Zeroing contentInset is important, as UIKit will set the top inset for the navigation bar even though
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// our view is only horizontally scrollable. This causes UICollectionViewFlowLayout to log a warning.
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// From here we cannot disable this directly (UIViewController's automaticallyAdjustsScrollViewInsets).
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cv.zeroContentInsets = YES;
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ASRangeTuningParameters preloadParams = { .leadingBufferScreenfuls = 2.0, .trailingBufferScreenfuls = 2.0 };
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ASRangeTuningParameters renderParams = { .leadingBufferScreenfuls = 1.0, .trailingBufferScreenfuls = 1.0 };
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[self setTuningParameters:preloadParams forRangeType:ASLayoutRangeTypeFetchData];
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[self setTuningParameters:renderParams forRangeType:ASLayoutRangeTypeDisplay];
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}
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#pragma mark - Helpers
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- (void)scrollToPageAtIndex:(NSInteger)index animated:(BOOL)animated
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{
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NSIndexPath *indexPath = [NSIndexPath indexPathForItem:index inSection:0];
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[self.view scrollToItemAtIndexPath:indexPath atScrollPosition:UICollectionViewScrollPositionLeft animated:animated];
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}
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#pragma mark - ASCollectionViewDataSource
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- (ASCellNode *)collectionView:(ASCollectionView *)collectionView nodeForItemAtIndexPath:(NSIndexPath *)indexPath
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{
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ASDisplayNodeAssert(_pagerDataSource != nil, @"ASPagerNode must have a data source to load nodes to display");
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ASCellNode *pageNode = [_pagerDataSource pagerNode:self nodeAtIndex:indexPath.item];
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return pageNode;
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}
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- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section
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{
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ASDisplayNodeAssert(_pagerDataSource != nil, @"ASPagerNode must have a data source to load nodes to display");
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return [_pagerDataSource numberOfPagesInPagerNode:self];
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}
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- (ASSizeRange)collectionView:(ASCollectionView *)collectionView constrainedSizeForNodeAtIndexPath:(NSIndexPath *)indexPath
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{
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return ASSizeRangeMake(CGSizeZero, self.view.bounds.size);
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}
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#pragma mark - Data Source Proxy
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- (id <ASPagerNodeDataSource>)dataSource
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{
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return _pagerDataSource;
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}
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- (void)setDataSource:(id <ASPagerNodeDataSource>)pagerDataSource
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{
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if (pagerDataSource != _pagerDataSource) {
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_pagerDataSource = pagerDataSource;
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_proxy = pagerDataSource ? [[ASPagerNodeProxy alloc] initWithTarget:pagerDataSource interceptor:self] : nil;
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super.dataSource = (id <ASCollectionDataSource>)_proxy;
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}
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}
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- (void)proxyTargetHasDeallocated:(ASDelegateProxy *)proxy
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{
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[self setDataSource:nil];
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}
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@end
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